100t-120(t-0.5)怎样化简?
问题描述:
100t-120(t-0.5)怎样化简?
在课本上化简过程为100t+120t-60=220t-60
我不明白的是式子中60是从哪里来的,t-0.5怎么变成了60?
答
100t-120(t-0.5)
=100t+120t-120x0.5
=100t+120t-60
=220t-60